/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraDataSet.h
Allows immediate access to GPU data on the CPU, you can then useFNiagaraDataSetAccessorto access the data. This will make a copy of the GPU data and will stall the CPU until the data is ready from the GPU, therefore it should only be used for tools / debugging. For async readback seeFNiagaraSystemInstance::RequestCapture.
class FScopedNiagaraDataSetGPUReadback